c# – 有一个快速的方法来解析大型文件与正则表达式？

示例文件大小为148,208KB

我正在使用正则表达式来解析每一行：

这是我的c#代码：

private static void ReadTheLines(int max,Responder rp,string inputFile)
{
    List<int> rate = new List<int>();
    double counter = 1;
    try
    {
        using (var sr = new StreamReader(inputFile,Encoding.UTF8,true,1024))
        {
            string line;
            Console.WriteLine("Reading....");
            while ((line = sr.ReadLine()) != null)
            {
                if (counter <= max)
                {
                    counter++;
                    rate = rp.GetRateLine(line);
                }
                else if (max == 0)
                {
                    counter++;
                    rate = rp.GetRateLine(line);
                }
            }
            rp.GetRate(rate);
            Console.ReadLine();
        }
    }
    catch (Exception e)
    {
        Console.WriteLine("The file could not be read:");
        Console.WriteLine(e.Message);
    }
}

这是我的正则表达式：

public List<int> GetRateLine(string justALine)
{
    const string reg = @"^d{1,}.+[(.*)s[-]d{1,}].+GET.*HTTP.*d{3}[s](d{1,})[s](d{1,})$";
    Match match = Regex.Match(justALine,reg,RegexOptions.IgnoreCase);

    // Here we check the Match instance.
    if (match.Success)
    {
        // Finally,we get the Group value and display it.

        string theRate = match.Groups[3].Value;
        Ratestorage.Add(Convert.ToInt32(theRate));
    }
    else
    {
        Ratestorage.Add(0);
    }
    return Ratestorage;
}

这是一个解析的例子,通常是大约20万行：

10.10.10.10 – – [27/Nov/2002:16:46:20 -0500] “GET /solr/ HTTP/1.1” 200 4926 789